so far this summer, the heat is blamed for at least 13 deaths in maryland, 5 in california and 4 in new york state. scientists point to el nino and the effects of global warming as well as the jet stream further north than usual preventing cooler air from moving south. >> water, sunscreen. take breaks when we get tired. think that's how we're dealing with it. >> reporter: here in chicago, this is the fourth straight day of 90-degree temperatures. for much of the country and in particular the northeast, a break from the heat may be days away. ron. >> okay, thanks, eric horng reporting from chicago. >>> while the first family got a bit of a break from the weather. as they enjoyed their weekend in maine. where it was only 81 degrees, where they were today. the obamas toured an historic lighthouse. in acadia national park. and then got a little hiking in. but the president, meanwhile, was turning up heat on the republicans in his weekly address. >> too often, the republican leadership in the united states senate chooses to filibuster our recovery and obstruct our progress. i think these sen